List of top Chemistry Questions

Examine the following observations: (a) Transition elements generally form coloured compounds.
(b) Zinc is not regarded as a transition element.
Define the following terms:
(a) Pseudo first-order reaction
(b) Half-life period of reaction (\(t_{1/2}\))
The decomposition of NH$_3$ on platinum surface is a zero-order reaction. What are the rates of production of N$_2$ and H$_2$ if k = 2.5 $\times$ 10$^{-4}$ mol L$^{-1}$ s$^{-1}$?
The rate constant for a zero order reaction A $\to$ P is 0.0030 mol L$^{-1}$s$^{-1}$. How long will it take for the initial concentration of A to fall from 0.10 M to 0.075 M?
Assertion (A): Vitamin D cannot be stored in our body.
Reason (R): Vitamin D is fat-soluble vitamin and is not excreted from the body in urine.
Assertion (A): Cu cannot liberate H$_2$ on reaction with dilute mineral acids.
Reason (R): Cu has positive electrode potential.
The diamagnetic species is :
The complex ions [Co(NH$_3$)$_5$(NO$_2$)]$^{2+}$ and [Co(NH$_3$)$_5$(ONO)]$^{2+}$ are called
The element having [Ar]$3d^{10}4s^1$ electronic configuration is
Which of the following reagents are suitable to differentiate Aniline and N-methylaniline chemically?
According to the Heisenberg's Uncertainty principle, the value of \(\Delta v \cdot \Delta x\) for an object whose mass is \(10^{-6}\) kg is
Which of the following methods of expressing concentration are unitless?
Which of the following statements are true about \( [NiCl_4]^{2-} \)?
(a) The complex has tetrahedral geometry.
(b) Co-ordination number of Ni is 2 and oxidation state is +4.
(c) The complex is sp\(^3\) hybridised.
(d) It is a high spin complex.
(e) The complex is paramagnetic.
Given below are two statements.
Among the following 0.1 m aqueous solutions, which one will exhibit the lowest boiling point elevation, assuming complete ionization of the compounds in solution?

Variation of solubility with temperature \(T\) for a gas in liquid is shown by the following graphs. The correct representation is 

Arrange the following compounds in their decreasing order of reactivity towards nucleophilic addition reaction.
A member of the Lanthanoid series which is well known to exhibit +4 oxidation state is
Which examples of carbohydrates exhibit \(\alpha\)-link (\(\alpha\)-glycosidic link) in their structure?

Among the following, identify the compound that is not an isomer of hexane: 

180 g of glucose, \(C_6H_{12}O_6\), is dissolved in 1 kg of water in a vessel. The temperature at which water boils at 1.013 bar is ______ (given, \(K_b\) for water is 0.52 K kg mol\(^{-1}\)). Boiling point for pure water is 373.15 K
The organometallic compound (CH3)3CMgBr on reaction with D2O produces

Chlorobenzene reacts with bromine gas in the presence of Anhydrous AlBr_3 to yield p-Bromochlorobenzene. This reaction is classified as 
 

In the following pairs, the one in which both transition metal ions are colourless is

The major product formed when 1 - Bromo-3-Chlorocyclobutane reacts with metallic sodium in dry ether is